SU1408140A1 - Screw drive for turning object, mainly aerial, relative to its base - Google Patents

Abstract

The invention relates to mechanical engineering and can be used to rotate an object such as an antenna with a limited guidance sector, such as communication antennas with geostationary satellites. The purpose of the invention is to expand the kinematic possibilities by increasing the length of the screw and providing it with an additional removable section. When the object is rotated at a small angle relative to the base, the screw 3 is moved by a small amount, and only the telescopic skin works. X 12-14. If it is necessary to rotate an object at a large angle, then an additional section 15, 16 is removed. The screw actuator rotates at a large angle, and this section of the casing is mounted on the free end of the screw 3 and fixed to nut 7. 8 Il.

Description

About 00

four

Shzobre

one

14

The device is mechanical: it can be used to rotate an object like an antenna with a limited guidance sector, such as communication antennas with geostationary satellites.

The purpose of the invention is to expand the kinematic possibilities by increasing the screw length | s and supplying it with additional

Noah

sectioning section.

15

Kah FIG. 1 shows an object rotated with the help of a screw drive; in fig. 2 is a section A-A in FIG. 1 on oig. 3 is a section BB in FIG. 2; in fig. 4 - object with sections removed in the middle part of the screw, general view; in fig. 5 is a sectional view BB in FIG. four; in fig. 6-8 are diagrams for determining the screw strokes and the dimensions of the casing elements.

The rotational drive around the Y axis (perpendicular to the plane of Fig. 1) of object 1, for example, the antenna mirror, relative to the base 2, contains a lead screw 3, one end of which is fixed in bearings in Kopntyce 4 and connected by an open gear transmission 5 to the gear motor 6, and nut 7. Case ft and nut 7 pivotally, on semi-axis x

20

removed from the casing 12. Since the length of the protruding part of the screw when the 12 sections 16 are installed in the casing is one, and at the removed sections it is the other one that is longer than the length of the removed elements, these elements can be used to build the casing 13 (Fig. 4 and 5). It is obvious that, similarly to section 16, they can be used to build up the casing 13 also in its telescopic design.

The minimum distance C between the housing 4 and the nut 7 (FIGS. 6-8) is determined by the length of the fully folded telescopic part 14 of the casing 12 (the removable part of the casing is removed), and the maximum level of M between them (with the removable part of the casing installed, FIG . 2 and 8) is equal to

M А + С-ГгВ, (1)

where A is the magnitude of the expansion of the telescopic part of the casing (distance equal to the screw travel determined by the possibility of increasing the length of the telescopic part of the casing);

A-KI - length of the extended telescopic part 14 of the casing;

and 9, parallel to the Y axis, are installed in crown; - SB — the length of part 15 of the casing.

mattes 10 and 11, mounted respectively on the object I and the base 2.

P

ka 7 tel

When the object 1 rotates, the body 4 and the nut come closer or are removed from each other relative to each other (the solid lines in Fig. | 1-5 show the most expanded, the point | the shifted position). To protect the screw from contamination, all its open ones are placed in 3 covers 12 and 13 that are coaxial with the screw. Casing 12 is telescopic, sliding, located between housing 4 and nut 7 and fixed to them with their ends. The casing 13 is fixed on the nut 7 and can be made constructively either rigid or telescopic.

The telescopic casing 12 consists of two parts: joined together along the length (end caps) of the telescopic part 14 and a rigid part 15 consisting of one or several sections 16 and 2 joined along the length, each of which is made detachable along the axis of the screw 3, for example, as shown in FIG. 3. Sections 16 are removable, they can be installed (Fig. 1 and 2) or removed (partially or completely, Fig. 4 and 5) depending on the calculated antenna pointing angle at the target.

If the casing 13 is rigid, its length may vary with the length of the casing 12 or remain unchanged. In this case, its length should be sufficient to accommodate the protruding portion of the screw 3 behind the nut 7 with the body 4 and the nut 7 most closely approaching, or build up sections 16,

In the general case, the lengths B of sections 16 may be different and be taken from the given transfer angles. If it is necessary to overlap the entire specified range of transfer angles, it is advisable to make the removable part of the jacket 30 out of a certain number of n sections 16 of the same length B, in this case ZBi nB.

Let us determine the optimal sizes of the values of A and B for the latter case. Denote by f - the specified angle of the antenna,

35 reduced to the length of the lead screw; F - reduced to the length of the screw transfer angle when installing sections, 1F || - the corresponding values of the ranges of angles:

FS -;

Q p is the predetermined maximum deviation of the working angle of inclination from the cutting position, reduced to the length of the lead screw. FIG. 6-8 are diagrams of the mutual positions of the drive elements in the absence of sections 16 (FIG. 6), with one 45 of section 16 (FIG. 7) and with i (i 2) of such sections (FIG. 8). From the diagrams follows; that with (A – r); (2) with i l (B + p), XA + B-p); (3)

50

55

with i sections (1B + c) F. {(A + iB-p) (4)

From dependencies (2) and (3) it follows that

to completely cover the range from p to

(A-4-Bp) it is necessary that Fo m-ks F mi "

those. to

(A-p) (B-fp) or A B-f 2p. (5) From equations (2) and (4) it follows that the value of the range of the angle of transfer at the maximum i n is equal to

removed from the casing 12. Since the length of the protruding part of the screw when the 12 sections 16 are installed in the casing is one, and at the removed sections it is the other one that is longer than the length of the removed elements, these elements can be used to build the casing 13 (Fig. 4 and 5). It is obvious that, similarly to section 16, they can be used to build up the casing 13 also in its telescopic design.

The minimum distance C between the housing 4 and the nut 7 (FIGS. 6-8) is determined by the length of the fully folded telescopic part 14 of the casing 12 (the removable part of the casing is removed), and the maximum level of M between them (with the removable part of the casing installed, FIG . 2 and 8) is equal to

M А + С-ГгВ, (1)

where A is the magnitude of the expansion of the telescopic part of the casing (distance equal to the screw travel determined by the possibility of increasing the length of the telescopic part of the casing);

A-KI - length of the extended telescopic part 14 of the casing;

with i sections (1B + c) F. {(A + iB-p) (4)

From dependencies (2) and (3) it follows that

to completely cover the range from p to

(A-4-Bp) it is necessary that Fo m-ks F mi "

those. to

(A-p) (B-fp) or A B-f 2p. (5) From equations (2) and (4) it follows that the value of the range of the angle of transfer at the maximum i n is equal to

or

1F1 A- | -PV-2r

| FiV (n + 1) and .-.

(6)

nfir-

From (5) and (7) we find the minimum dimensions that satisfy the conditions for complete overlapping of the required range of working tracking and transfer angles:

B. A B + 2p -M-f2p.

Reducing the magnitude of the telescopic casing spacing - A in the proposed device against (| F | + 2p) (A + pV) in the well-known — allows a significant reduction in the folded C, the casing, the screw length and the axial dimensions of the drive as a whole, 15 which allows It is easier to fit it into the tight space and thereby expands the scope of the drive.

Reducing the length of the extended teleskoAQ, the front cover 17 is removed from the casing 13, the dismounted section 16 is installed in its place, the second end of the corona is closed by the cover 17 (Fig. 5).

Claims (1)

Invention Formula A screw drive for rotating an object, preferably an antenna, relative to its base, containing the intended 25 12 - (Cf A) in the proposed 2 hinged connection with the object of the feed device against (C + | F | + 2p) in the known - eliminates its sagging, touching the screw casing during operation of the drive, clogging the drive with wear products and increases the efficiency of the drive . The number of sections 16 of the removable housing part is established from design considerations: as n decreases, the value of A decreases, and therefore the minimum distance between the housing 4 and the nut 7 can be reduced and, thus, OQ minimizes the axial dimensions of the entire drive. The number i installed in the composition of the casing 12 at a given angle FD, sections 16 is determined from relationship (4): a screw, the end of which is fixed in the housing with the help of bearings, a nut interacting with the screw and pivotally connected to the base, mounted between the housing and the nut, covering the screw telescopic casing, including at least two sections, characterized in that, in order to widen the kinematic capabilities, the drive is provided with at least one split section in the axial plane with an additional section covering the screw and intended for alternate placement on the screw or in the middle part with the possibility of fastening either to the telescopic casing and housing, or at the end of the screw with the possibility of attachment to the nut. 15  i fc. (8) BB In the case of an expandable casing 13, the remaining p-i sections 16 are inserted into the casing of the casing 13. To dismantle the sections 16 from the casing 12, the section to be removed is disconnected from adjacent elements, separated along the axis of the screw and removed from the screw, and then the adjacent drive elements are joined Between each other, the front cover 17 is removed from the casing 13, the dismantled section 16 is installed in its place, the second end of the casing is closed by the cover 17 (Fig. 5). Invention Formula A screw drive for rotating an object, preferably an antenna, relative to its base, containing the intended 25 2o swivel with object corOQ a screw, the end of which is fixed in the housing with the help of bearings, a nut interacting with the screw and pivotally connected to the base, mounted between the housing and the nut, covering the screw telescopic casing, including at least two sections, characterized in that, in order to widen the kinematic capabilities, the drive is provided with at least one split section in the axial plane with an additional section covering the screw and intended for alternate placement on the screw or in the middle part with the possibility of fastening either to the telescopic casing and housing, or at the end of the screw with the possibility of attachment to the nut. .V v fig a sixteen 1B 15 F Hfal / ---. ., W - - FIG. five sixteen FIG. FIG. 6 srag.7